251440272160 has 96 divisors (see below), whose sum is σ = 740605928832. Its totient is φ = 78370990080.

The previous prime is 251440272137. The next prime is 251440272163. The reversal of 251440272160 is 61272044152.

It is not an unprimeable number, because it can be changed into a prime (251440272163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10192237 + ... + 10216876.

It is an arithmetic number, because the mean of its divisors is an integer number (7714645092).

Almost surely, 2^251440272160 is an apocalyptic number.

251440272160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251440272160 is an abundant number, since it is smaller than the sum of its proper divisors (489165656672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251440272160 is a wasteful number, since it uses less digits than its factorization.

251440272160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20409146 (or 20409138 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The spelling of 251440272160 in words is "two hundred fifty-one billion, four hundred forty million, two hundred seventy-two thousand, one hundred sixty".